src/test/run-pass/issues/issue-29166.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // run-pass
  12 // This test ensures that vec.into_iter does not overconstrain element lifetime.
  13
  14 pub fn main() {
  15     original_report();
  16     revision_1();
  17     revision_2();
  18 }
  19
  20 fn original_report() {
  21     drop(vec![&()].into_iter())
  22 }
  23
  24 fn revision_1() {
  25     // below is what above `vec!` expands into at time of this writing.
  26     drop(<[_]>::into_vec(::std::boxed::Box::new([&()])).into_iter())
  27 }
  28
  29 fn revision_2() {
  30     drop((match (Vec::new(), &()) { (mut v, b) => { v.push(b); v } }).into_iter())
  31 }